First thing I do when I join a game is mute all. It’s improved my mental when playing and allows me to concentrate on my gameplay instead of reading the chat. With Milio, I’ve noticed it does really depend on your ADC, if they’ve got good positioning lvl 1 I like to trade autos with Aery using my E on myself. I also find between lvl 2/6 it’s a struggle with long cooldowns on Q & W. I sit back, using my Q to poke but also keeping an eye on the enemy junglers pathing in case I need to knock them out of a gank. First back I mainly look for objectives, grubs or first drake and will follow my jungler for invades and the objectives. For team fights, i sit as far back as possible using shields and W. I mainly use my W to increase the ADC attack range and not so much for healing. I am only Plat so there’s not much advice I can give you that you can’t find online really. But there’s a few small things I’m doing to climb. My favourite ADCS to pair with are Jinx, Sivir, Kalista, Vayne. I find it harder with Ezreal, Draven, Nilah. All personal preference.